Drill-socket.



F. MAIER.

DRILL SOCKET.

APPLIGATION FILED SEPT. 22, 1909.

Patented Apr. 19,1910.

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FREDERICK MAIER, 0F PHILADELPHIA, PENNSYLVANIA.

DRILL-SOCKET.

Specification of Letters Patent.

Patented Apr. 19, 1910..

Application filed September 22, 1909. Serial No. 518,964..

To all whom it may concern:

Be it known that I FREDERICK MAIER, a citizen of the United States,residing at Phil delphia, in the county of Philadelphia and StateofPennsylvania, have invented certain new and useful Improvements inDrill-Sockets, of which the following is a specification.

My invention relates to an improved drill socket, the object of theinvention being to provide J device of this kind of extremely simpleconstructiomhaving a tapering compression bushing adapted to hold thedrill, the greater the pressure on the drill, the greater the clampingaction of the bushing will be. p

A further object is to provide an improved drill socket, which isconstructed to withstand very hard usage, which will securely clamptaper shank drills of various kinds, which dispenses with any necessityfor driving or hammering the drill into the socket to clamp the same,and which is of extremely simple construction, strong and durable inuse.

, With these and other objects in View, the invention consists incertaln novel features of construction, and combinations andarrangement-s of parts as will be more fully hereinafter described andpointedout in the claims.

In the accompanying drawings, Figure 1, is a view in side elevationillustrating my improvements. Fig. 2, is a view in longitudinal section.Fig. 3, is an end view of the socket showing the drill in cross section,and Fig. 4:, is a view'in elevation of th compression bushing removed.

1 represents my improved drill socket, which is provided in one end witha conical or tapering bore 2, which communicates with a cylindrical bore3-of smaller diameter, forming at the juncture of said bores 2 and 3 anannular shoulder 4:.

5 represents my improved compression bushing, which is made tapering orrather is in the form of a conical or helical coiled spring, which isadapted to fit within the bore 2, with its smaller end bearing againstthe shoulder 4.

A cap ring 6 is secured to the end of the socket 1 by means of screws 7,and is of an internal diameter less than the larger di ameter of thebushing 5, so as to confine the bushin within the taperin bore 2.

8 an 9 are slots registering with the bore 3, and with the inner end ofbore 2, and are adapted to receive any suitable tool to coinpress thebushing 5 longitudinally to release the drill illustrated at 10 wheneverdesired.

In operation the tapering drill 10 is inserted within the bushing 5 andthe drilling operation begun the greater the ressure upon the drilthe-ti hter will the ushing bind the same, for as e drill is forced backward into the bushing, due to the taper of the bushing 5 and the bore 2,the internal diameter of the bushing will be decreased, thus more firmlygrasping the drill, as a greater pressure is applied. When it is desiredto release the drill, a suitable tool is entered in either of the oenings 8 or 9 to compress the bushing 5 longitudinally, to expand thebushing laterally and release the drill. Even thoughthe bushing shouldbreak during the operation of drilling it will hold the drill, and canbe easily replaced by simply removing the cap ring 6.

Various slight changes might be made in the general form andarrangements of parts described without departing from my invention, andhence I do not restrict myself to the precise details set forth, butconsider myself at liberty to make such changes and alterations asfairly fall within the spirit and scope of the claims.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A drill socket and a tapering compression bushing in said socket,conslsting of a conical or helical coiled spring.

2. A drill socket having a taper ng bore, and a tapering compressionbushing, consistin in sai tapering bore.

3. A drill socket having a tapering bore, and a c lindrical bore smallerthan the smallest iameter of the tapering bore, com

municating with the tapering bore, and

forming an annular shoulder at the smaller end of the tapering bore,openings in the sides of said socket communicating with said cylindricaland tapering bores, and a tapering compression bushing in said taperingbore havin its smaller end against said annular shouFder.

4. A drill socket having a tapering bore,

end of the tapcing bore, openings in the sides of said socketcommunicating with said cylindrical and tapering bores, and a cap ringsecured to the end of the socket, and of an internal diameter smallerthan the diameter of the larger end of the tapering bore, whereby saidrlng serves to confine the compression bushing in said tapering bore.

In testimony whereof I have signed my name to this specification in thepresence of 10 two subscribing witnesses.

FREDERICK MAIER.

Witnesses R H. KRENKEL, J. A. L. MULHALL.

